Fuel pump operating part



Dec. 27, 1932; A. M. BABlTcH 1,891,902

FUEL PUMP OPERATING PART Filed Aug. 2, 192e 45 cludinlg Patented Dec. 27, 1932 UNITED STATES PATENT' oFF-lcs ABRAHAM M. BABITCH, OF FLINT, MICHIGAN, ABSIGNOB T A C SPARK PLUG COMPANY, 0F FLINT, MICHIGAN, A COMPANY OF MICHIGAN FUEL PUMP OPERATING PART Applicationl'ledlugust 2, 1928. Serial No. 297,021.

As may be understood from the above title, this invention relates to fuel pumps such as are now employed upon automotive vehlcles,

and elsewhere in connection with internal k2@ it should'be understood that the principles of this invention are believed to be applicable to other reciprocatory pumps in which provision is made for the use of resilient means to eii'ect an expulsion stroke of a pumping 25 element, the intake stroke thereof being positively effected but variable in length.

Other objects of this invention, all forms of which involve the use of either a sectional actuating element or sectional intermediate means between an actuating element and a part to which a reciprocatory pumping element, such as a diaphragm, is connected (the mentioned sections being provided with resilient means tending to flex a joint therebetween, and/or tending to hold one section of an actuating element in engagement with a cam, or the like) may be best appreciated from the following description of illustrative embodiments of said invention, taken in connection with the appended claims and the accompanying drawing:

Fig. 1 may be referred to as a substantially median vertical section through a pump inan embodiment of this invention,-

not al features therein shown being necessarily included in any one pump.

Fig. 2 is an enlarged detail view, comparable with a lower central portion of Fig. 1,

but separately illustrating one simple and advantageous embodiment of this invention.

ig. 3 is a view similar to Fi 2, but separately showing an alternative single embodiment of this invention.

Fig. 4 is a view comparable with Fig. 1but 55 less complete and illustrative of a further modification in which separate resilient means may advantageously be employed constantly to press one end of an actuating lever into engagement with a cam, or the like.

Referring first to Figs. 1 and 2 as showing conventional parts of a fuel pump of the general character disclosed in my mentioned prior application, a main structural element in the form of a body casting 1 and a sub- 65 sidiary structural element in the form ofa cover casting 2 are shown as cooperating in the retention of a reciprocatory pumping element in the form of a flexible diaphragm 3,-this being conditionally effective to vary the cubic contents of a pump chamber 4, shown as provided in the cover casting 2.

The cover casting may be provided not only with an inlet passage 5 and an outlet passa e 6, 7 (the latter being shown as valved 75 at 8) ut also with an inlet valve and means for supporting a lilter, not shown.

An oscillable actuating element in the form of a lever comprising arms or sections 9 and 9', said sections being either integral or sepa- '80 rate, may be pivoted to the casting 1, as at 10; and the outer section 9 thereof may be adapted continuously to engage a reciprocatory or rotatively driven element such as a cam 11 upon a shaft 12,-any suitable means 85 being employed to eect the result last referred to.

Comino now to the novel features of the new com ination upon which protection is herein sought, assuming some suitable han- 9 dling element (such as, for example, a socalled diaphragm stem 13) to be suitably attached to a pressure-responsive pumping element such as the diaphragm 3, and assuming resilient means such as a compression spring 14 to be em loyed in initially imparting expulsion stro es to said pumping element, thrust-refusing means such as links or sections 15, 16, centrally pivoted to one another at 17 maybe respectively pivoted at 10 a tension spring 21 (connected with one of said links or with the pivot 17 and with a fixed element such as a so-called plug 22,

shown as adjustably inserted in the casting 1') may be employed.

In Fig. 2, the actuating element plvoted at 10 is shown as formed in a single piece which may be regarded as comprising arms or sections 9a and 9a; and either of the mentioned springs o1" the two spring together may be of sufficient power not only to b1as the described intermediate means, comprising sections 15 and 16, toward a flexed relationshlp, preventing a parallel relationship therebetween, but also incidentally to hold the s ection 9 (or 9a) of the described actuating means against the cam 11 or its equivalent; but, in addition to or instead of the mentioned spring or springs, use may be made of resilient means associated with a joint between the sections of a sectional actuating element, one suitable construction for the purpose here referred to being separately illustrated in Fig. 3.

In Fig. 3, as also in Fig. 1,'the sections 9 and 9 are shown as separately movable upon the pivot pin 10; said pin is here shown as surrounded by coils of a spring 23; oppositely tending portionsv 24 and 25 of this spring are shown as so engaging the respective sections 9 and 9 as to flex the joint therebetween; and the respective sections mentioned are provided with means (as, inclined opposable faces 26, 26 and 27, 27') effective to limit relativerotation between the sections 9 and 9 in opposition to the tendency of the spring 23. o

Using the construction last referred to, the inner actuating element section 9 may be secured to an intermediate element such as a link section 15-16; an end 28 of the spring 23 may optionally so engage the casting 1 as to press the section 9 always toward the cam 11 and/or, if the spring 23 is of suliicient power, the previously mentioned springs can be dispensed with. The thrust-refusing construction last described may be relied upon to impart intake strokes of a diaphragm 3, or its equivalent, although obviously incapable of imparting expulsion strokes thereto.

As above implied, any one or two or all three of the described springs may be concurrently employed; but there is suggested in Fig.4 an alternative construction in which, although resilient means may be employed to prevent a noise-producing contact between metallic parts and/or to predispose or bias sections of a thrust-refusing intermediate means toward relative flexure, no metallic springs need be interposed, between the relatively movable sections.

The figure last referred to shows a modified form of linkage in which two separate sets of links are used, each or either of which may be similar to the links or sections shown in Fig. 1. The substantially parallel links 53 and 54 are not directly connected but are secured upon the same lside of flattened end portions of the diaphragm stem 55 and an actuating element in the form of a lever or rocker arm comprising a section 56; and the links 57 and 58 are placed upon the other side of said flattened end portions, pivot pins `59, 60, 61 and 62 being employed as shown.

Optionally, cushioning or compression resistant means such as leather or other inserts 63 may be so interposed as to prevent noisy contact between parallel links.

The construction here referred to is such that neither of the intermediate pins 61, 62 can ever reach the same vertical line with the pivot pins 59, 60, the result being that the links will always be predisposed toward a flexing movement and incapable of transmitting a thrust to pumping element 3 or its equivalent, although conditionally effective to impart intake strokes thereto whenever pressure within the chamber 4 is insufficient to hold said pumping element down. It will be obvious, however, that unless more powerful resilient means than the suggested inserts 63 are interposed between the described pairs of links or their pivots 61 and 62 separate resilient means (such as, for example, a compression spring, which may be confined between cups 64 and 65) may advantageously be employed (as described in the mentioned prior application) resiliently to hold a section 56 of the actuating lever against a suitable cam, or the like.

Although the above description includes several alternative embodiments of this invention, these being capable of either conjoint or separate use, it will be obvious that additional modifications thereof might easily be devised, without departure from the spirit and scope of the invention, and as the same is indicated above and in the following claims.

I claim:

1. In means for imparting a variable stroke to a pumping element conditionally reciprocable in a pump chamber; a handling element attached to said reciprocable element; actuating means comprising a section which is reciprocable by a cam; and intermediate means pivotally connected with a section of said actuating means and with said handling element,one of the mentioned means com.- prising sections which are connected by a pivotal joint and are provided with resilient means tending to prevent parallelism of said mensen sections en@ to prevent transmissicn o e thrust therethrough.

2. An organization as defined in claim i in which said joint comprises e pivot pin anni said resilient Ineens comprises a spring which so acts on seid pin as to tend to ex seid joint.,

3. An organization as defined in claim l in which said resilient means is eective both to prevent transmission of a thrust through said intermediate means and to hod a section of said actuating means against said cem In testimony whereof I nx my signature.

ABRAHAM M. BBTCH. 

